Series:	S0402
Packaging:	Bulk
Part Status:	Active
Type:	Wirewound
Material - Core:	Alumina
Inductance:	12nH
Tolerance:	±5%
Current Rating:	475mA
Current - Saturation:	--
Shielding:	Unshielded
DC Resistance (DCR):	220 mOhm Max
Q @ Freq:	21 @ 250MHz
Frequency - Self Resonant:	3.6GHz
Ratings:	--
Operating Temperature:	-55°C ~ 125°C
Inductance Frequency - Test:	250MHz
Mounting Type:	Surface Mount
Package / Case:	0402 (1005 Metric)
Supplier Device Package:	0402 (1005 Metric)
Size / Dimension:	0.043" L x 0.025" W (1.09mm x 0.64mm)
Height - Seated (Max):	0.030" (0.76mm)

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Fixed Inductors

Inductors, also known as coils, are fundamental components of any electrical system. Among passive electronic components, inductors are used for smoothing, filtering, and storing and transferring electrical energy. The use of inductors in electric circuits is highly advantageous due to their self-regulating properties that make them immune to failures. Their use in active circuits such as oscillators and amplifiers is also highly desirable.In this article, we will discuss the S0402-12NJ3 inductor and explain its application field and working principle. The S0402-12NJ3 is a high-frequency, surface-mount inductor that measures 0.4mm×0.2mm. It is constructed of a ferrite core and two outside windings. The ferrite core is made from ceramic materials, while the outside windings are made of enameled copper wire, allowing for a maximum DC current of 75mA. The inductor has a high Q factor and a low SRF, making it highly suitable for high-frequency and high-power applications. The inductor is used in a wide range of applications including computer peripherals, automotive accessories, telecom devices, and consumer electronics. It is also suitable for use in digital, analog and power audio electronics. In addition, it is widely used for automotive applications such as power supply filters, audio filter circuits, and delay lines.The working principle of the S0402-12NJ3 inductor is based on the electromagnetic induction law. When electric current flows through the winding, a magnetic field is generated. The strength of this field is determined by the amount of electric current. This magnetic field induces an electromotive force (EMF) in the opposite direction of the current as per Faraday\'s law. This EMF opposes the original current, thus reducing its magnitude. This is known as inductive resistance and is responsible for the inductive nature of the S0402-12NJ3 and other inductors.The main reason why this inductor is used in some of the most popular applications is its low profile with excellent construction characteristics. It also has a low DC resistance, which makes it ideal for applications requiring a stable continuous current. Another advantage of this inductor is its high heat dissipation, making it perfectly suited for high-frequency applications. Its tight construction also makes it immune to vibrations and shock.The inductance of the S0402-12NJ3 inductor is defined as: its inductance is the total voltage divided by the total current induced into the two windings. Inductance is expressed in millihenries (mH) and is dependent on the amount of turns in the windings and the geometry of the core. As the number of turns increases, the inductance in the winding also increases.In summary, the S0402-12NJ3 inductor is a high-frequency, surface-mount terminal which is used in a wide range of applications. Its ferrite core and two outside windings constructed of enameled copper wire make it highly suitable for high-power and high-frequency applications. The working principle of the inductor is based on the electromagnetic induction principle where a magnetic field caused by passing electric current induces an electromotive force that opposes the original current, thus reducing its magnitude. Its low profile, low DC resistance, high heat dissipation, and tight construction make it a preferred choice in various high-frequency applications.

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